Two girls die as car submerges in southern San Diego County

Two 5-year-old girls were killed Sunday when the car in which they were passengers drove off the road and landed upside down in a reservoir in southern San Diego County.

The driver, Arlene Hernandez, 22, of Chula Vista, was arrested on suspicion of drunk driving, according to the California Highway Patrol. Hernandez and an adult male companion were able to escape when the car submerged in 30 feet of water in the Otay Lakes reservoir about 6:15 p.m.

Minutes later a U.S. Border Patrol agent got the two girls out of the car. They were flown to Rady Children's Hospital, where they were pronounced dead.

One of the girls was reportedly Hernandez's daughter.

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--Tony Perry in San Diego